Cylinder 3 misfire at low revs

[Whomightyoube]

Yeah it can be a right pain getting all the passages clean. The thing to remember is that you have to clean more than just the pilot fuel jet in the bowl. The idle circuit is the pilot air jet, the pilot fuel jet, the transfer ports and the mixture screw port. This diagram shows it well




At idle the butterfly valve is closed so air is drawn in through the pilot air jet (PAJ in the diagram), the air then goes to the holes in the side of the pilot fuel jet (PJ). Fuel is drawn up through the centre of the pilot fuel jet and mixes with the air from the pilot air jet. It then comes out the transfer ports just after the butterfly valve and also comes out the port at the mixture screw. So all of those passages need to be clear. If you just clean the pilot fuel jet in the bowl and don't clean the pilot air jet, transfer ports and idle screw port you can still have problems.

Great stuff. Is this a generic diagram or specific to the Fazer?


There is also another screw which looks like a jet but has no hole in it. Any idea what that is?


I took all jets and screws out in the bowl and carb cleaner and blew out with air. I guess the TP would be better to seat the pilot screw to force air through it. Are the MAJ and PAJ removeable?

[/size]There is also a small orifice next to the jets. Any ideas what this is?[size=78%]

[/size]I am wondering why it ran well for a short time after reving up to the lights when there were a couple of minutes idle, then lumpy again.[size=78%]